Piezoelectric Accelerometer Seismic Mass Segmentation
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Solution Overview
Problem
Existing acceleration measuring devices face challenges in cost-effective manufacturing and efficient detection of both positive and negative accelerations, with limitations in mechanical robustness and production economics.
Innovation Solution
The acceleration measuring device incorporates a seismic mass with two mass elements that function independently and cooperatively, allowing for the simultaneous detection of positive and negative piezoelectric charges, which are easily connected electrically and mechanically, and features a preloading assembly that applies a higher clamping force for enhanced signal pickup.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a single mass element is used in the seismic mass, then the device structure is simpler, but the ability to detect both positive and negative accelerations simultaneously is limited
Solution Approach 1:
The seismic mass is divided into two separate mass elements (first mass element and second mass element) that can be electrically connected in parallel. Each mass element is associated with its own piezoelectric system, allowing independent detection of positive and negative accelerations while maintaining a relatively simple overall structure
2Measurement precision
If a preloading assembly is added to apply clamping force, then the signal pickup efficiency is improved, but the device complexity and manufacturing cost increase
Solution Approach 1:
The preloading assembly applies a clamping force to the piezoelectric system in advance, before acceleration measurement begins. This preliminary mechanical preloading ensures that the piezoelectric elements are properly contacted and positioned, thereby improving signal pickup efficiency without requiring complex real-time adjustment mechanisms
3Measurement precision
If two mass elements are used with independent electrical connections, then the detection of positive and negative charges is improved, but the manufacturing cost increases
Solution Approach 1:
The two mass elements are electrically connected in parallel, merging their electrical outputs into a unified signal pathway. This configuration allows both mass elements to contribute to the detection of positive and negative charges simultaneously, while the parallel connection simplifies the electrical circuitry and reduces manufacturing complexity compared to independent connection schemes
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This design enables cost-effective production and improved signal detection capabilities, with a 100% to 500% higher clamping force compared to prior art, allowing for robust and efficient acceleration measurement across a wide temperature range.
Implementation Method 1
When the acceleration measuring device undergoes acceleration, the seismic mass exerts on the piezoelectric system a force that is proportional to its acceleration, wherein said force generates piezoelectric charges in the piezoelectric system
Data Source
AI summary
An acceleration measuring device includes a piezoelectric system, a seismic mass, and a base plate. The seismic mass exerts onto the piezoelectric system, a force that is proportional to the acceleration. The piezoelectric system responds to the force by generating piezoelectric charges that are electrically transmitted as acceleration signals. The seismic mass includes a first mass element responsible for generating positive piezoelectric charges. The seismic mass includes a second mass element responsible for generating negative piezoelectric charges.